Reland: Implement Aura side of unified touch text selection for contents

content/browser/renderer_host/input/ui_touch_selection_helper.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/renderer_host/input/ui_touch_selection_helper.h"
+
+#include "base/logging.h"
+#include "cc/output/viewport_selection_bound.h"
+
+namespace content {
+
+namespace {
+
+ui::SelectionBound::Type ConvertSelectionBoundType(
+    cc::SelectionBoundType type) {
+  switch (type) {
+    case cc::SELECTION_BOUND_LEFT:
+      return ui::SelectionBound::LEFT;
+    case cc::SELECTION_BOUND_RIGHT:
+      return ui::SelectionBound::RIGHT;
+    case cc::SELECTION_BOUND_CENTER:
+      return ui::SelectionBound::CENTER;
+    case cc::SELECTION_BOUND_EMPTY:
+      return ui::SelectionBound::EMPTY;
+  }
+  NOTREACHED() << "Unknown selection bound type";
+  return ui::SelectionBound::EMPTY;
+}
+
+}  // namespace
+
+ui::SelectionBound ConvertSelectionBound(
+    const cc::ViewportSelectionBound& bound) {
+  ui::SelectionBound ui_bound;
+  ui_bound.set_type(ConvertSelectionBoundType(bound.type));
+  ui_bound.set_visible(bound.visible);
+  if (ui_bound.type() != ui::SelectionBound::EMPTY)
+    ui_bound.SetEdge(bound.edge_top, bound.edge_bottom);
+  return ui_bound;
+}
+
+}  // namespace content